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How to use WHERE with DATEPART in MSSQL

Hi There,

I'd like to pull out records where the day of the week is Friday or Saturday. So I have the following query:

SELECT aId, aStatus
FROM Availability
WHERE DATEPART(weekday,aDate) = 5 OR DATEPART(weekday,aDate) = 6

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I get an error message thus:

Microsoft OLE DB Provider for SQL Server error '80040e14'

An expression of non-boolean type specified in a context where a condition is expected

Is it possible to use Datepart in this way, and if so, how can I fix this query? If not, what is the best way to achieve the same result?

Thank you,

1 Solution
AnujSQL Server DBACommented:
SELECT aId, aStatus
FROM Availability
WHERE DATEPART(weekday,aDate) IN (5,6)
The query works fine for me.  You can try putting parenthesis around the conditions, or using IN as suggested above.

Keep in mind that doing a query like that, with calculations on a database field, will always result in a table scan, so performance may be pretty poor if the table is large.  Use a calendar table or an indexed computed field if you need to improve performance.
stressfreewebsAuthor Commented:
Thanks...no idea why what I had wasn't working, but as soon as I swapped to this tidier version, it worked a treat!
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